Definitions:

1. A person who specializes in driving or applying nails, typically in a construction or manufacturing setting. NOUN
   • He worked as a nailer in the furniture factory.
2. A power tool used to drive nails into wood or other materials quickly and efficiently, commonly used in construction, carpentry, and framing work. NOUN
   • The carpenter used a nailer to fasten the boards together.

Synonyms:

• fastening tool
• nail gun